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For example, using Equation 1 with a 120 volt AC input on the primary and 12 volts AC
needed on the output, it would be necessary to step the voltage
down by a turns ratio
of 120/12 or 10 to 1. This means that for every 10 turns on the primary, the secondary
requires 1 turn.
As the voltage is stepped down, the current is stepped up by the same
ratio, and vice versa. If in the example, the primary was to draw 1
amp of current then
the secondary would draw 10 X 1 or 10 amps, since the current is stepped up by the
turns ratio which is 10 X 1. If a full wave bridge (capacitor filter) was being used to rectify
the 12 VAC @ 10
amps above, the following approximate DC outputs would be achieved
where K is approximately 0.85:
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